200 



CONDUCTIVITY AND VISCOSITY IN MIXED SOLVENTS. 



show an increase above the values calculated on the basis of averages. It is 

 to be noted also that the increase in fluidity with increase in dilution is greatest 

 in the 50 per cent and 75 per cent mixtures. 



The temperature coefficients of fluidity increase with increase in dilution 

 in the per cent and 50 per cent mixtures; but decrease with increasing dilu- 

 tion in the 25 per cent, 75 per cent, and 100 per cent mixtures. The largest 

 values are found in the per cent solutions. 



Tables 84, 85, and 86 (fig. 103) show that potassium sulphocyanate, in 

 mixtures of methyl alcohol and ethyl alcohol, exhibits an increase in fluidity 

 above the average values in the 50 per cent and 75 per cent mixtures. 



The temperature coefficients of fluidity decrease with increase in dilution 



260- 

 250 

 220 



200 

 



180 

 1'60 

 140 

 120 

 100 



Curve I, fluidities of N/10 

 potassium sulphocyanate in mix- 

 tures of acetone and methyl alcohol 

 at 0. 



Curve II, fluidities of mixtures 

 of acetone and methyl alcohol 

 at 0. 



Curve III, fluidities of N/10 

 potassium sulphocyanate in the 

 above mixtures at 25. 



Curve IV, fluidities of the 

 above solvent mixtures at 25. 



25jS 5056 75$ 



Percentage of Acetone 



FIG. 101. 



in every case, except the per cent mixture, the maximum value being in 

 the per cent mixture. 



Table 85 shows that the temperature coefficients of fluidity of potassium 

 sulphocyanate, in mixtures of methyl alcohol and water, increase with increase 

 in dilution of the solutions in the per cent, 25 per cent, and 50 per cent 

 mixtures; and decrease with increase in dilution in the 75 per cent and 100 

 per cent mixtures. The temperature coefficients of conductivity of copper 

 chloride in these mixtures increase with increasing dilution in every case, 

 except the 100 per cent mixture, where the opposite condition holds. The 

 temperature coefficients of conductivity of potassium sulphocyanate increase 

 with increase in dilution in all of the solvents. The temperature coefficients 

 of fluidity are largest in the 25 per cent mixture, and such is the case also for 



